Feat: Support for vscode settings expansions like ${workspaceFolder}

[Attempt3035]

Allows setting vscode settings with variable substitutions such as:

"java.import.gradle.java.home": "${workspaceFolder}/.vscode/mise-tools/java",
"java.import.gradle.user.home": "${workspaceFolder}/somewhere",
"java.import.gradle.home": "${workspaceFolder}/../../somewhereFarAway",

Also supports other substitutions available in vscode-variables package

PR currently open on vscode-java for same feature

[Attempt3035]

@microsoft-github-policy-service agree